Tighten the inner hexagon bolt whose function is to prevent valve disc from rotating and breaking the springs.

拧紧防止阀板转动的内六角螺栓，其作用是防止阀板转动拧断弹簧。

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Tighten the inner hexagon bolt whose function is to prevent valve disc from rotating and breaking the springs.

拧紧防止阀板转动的内六角螺栓，其作用是防止阀板转动拧断弹簧。

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